Consider the following statements for $\left[\mathrm{FeO}_{4}\right]^{2-}$
\[ \begin{array}{l} \text{(A) It is stable in the pH range 0-14} \\ \text{(B) It is stable in strongly basic medium only} \\ \text{(C) It is a very strong oxidizing agent} \\ \text{(D) The isomer shift in its Mossbauer spectrum is more negative compared to that of } \mathrm{FeCl_3}. \end{array} \]